• BoxFit.cover works by scaling an image uniformly (preserving its aspect ratio) until it completely fills the target viewport.
• It never stretches or distorts the image.It only crops the edges that overflow the screen boundaries.
• By providing multiple resolutions (like 750x1334 vs 1440x2960), you are manually managing image quality and crop factors. Instead, you should let Flutter handle device pixel density using its built-in asset variant system.

• Reduce to 2 Master Asset FilesKeep only your highest-resolution base images to ensure they look crisp on premium tablets and phones.

• Let Flutter Handle Device Scaling (Resolution Awareness)To prevent modern high-density screens from looking blurry, or older devices from wasting RAM on massive textures, use Flutter’s pixel ratio folders.
• Rename and organize your files in your project directory like this:

assets/
  └── images/
      ├── settings_background_portrait.jpg      (Standard resolution, e.g., 800x1280)
      ├── 2.0x/
      │   └── settings_background_portrait.jpg  (Medium resolution, e.g., 1200x1920)
      └── 3.0x/
          └── settings_background_portrait.jpg  (Highest resolution, e.g., 1600x2560)

• When you load AssetImage(’assets/images/settings_background_portrait.jpg’), Flutter automatically samples the 2.0x or 3.0x folder depending on the physical phone’s devicePixelRatio.
• This replaces steps 1 and 2 of your current algorithm entirely.

• Instead of calculating aspect ratio “distances” mathematically, use Flutter’s OrientationBuilder.
• It instantly tells you if the device is vertical or horizontal.

Widget build(BuildContext context) {
  return OrientationBuilder(
    builder: (context, orientation) {
      // Switch the asset string cleanly based on system orientation
      final assetPath = orientation == Orientation.portrait
          ? 'assets/images/settings_background_portrait.jpg'
          : 'assets/images/settings_background_landscape.jpg';

      return Container(
        width: double.infinity,
        height: double.infinity,
        decoration: BoxDecoration(
          image: DecorationImage(
            image: AssetImage(assetPath),
            fit: BoxFit.cover, // Handles uniform scaling and centering natively
          ),
        ),
        child: const Scaffold(
          backgroundColor: Colors.transparent,
          body: YourContent(),
        ),
      );
    },
  );
}

Bonus Option: The 1-Asset Approach

• If your background image does not have a strict focal point (e.g., it is an abstract gradient, subtle texture, or geometric pattern), you can reduce your asset count down to just one square asset (e.g., 2560 × 2560).
• Because BoxFit.cover clips whatever bleeds off the screen, a large square image will perfectly fill a tall phone screen and a wide tablet landscape screen automatically without a single line of orientation logic.
• Would you like to explore how to position the focal point of the image using Alignment options so important details don’t get cropped out, or are you concerned about RAM optimization for the high-resolution files?